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【多选题】
请说明食物中N-亚硝基化合物的来源及防止措施
A.
(1)来源①亚硝基化剂:NO。和一些氮氧化物(NO、NO2、N₂O3)等,主要是硝酸盐和亚硝酸盐。②胺类:由蛋白质分解成氨基酸并脱羧而成。
B.
(2)防止措施①控制食品加工中硝酸盐及亚硝酸盐的使用量(防止误食、不饮用苦井水)。②施用钼肥。③许多食物成分可防止亚硝基化合物危害作用。④防止食物霉变以及其他微生物污染。⑤提高维生素C摄入量。⑥注意口腔卫生、减少唾液中亚硝酸盐等。⑦制定标准并加强监测。
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举一反三
【单选题】It can be inferred from the passage that ______.
A.
the 1992 Los Angeles riots lasted a whole week
B.
Rodney King seemed very angry when he appeared on television on Friday
C.
media coverage of events as they occur can have either good or bad results
D.
most people who had seen the video of Rodney King beating agree with the verdict
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【单选题】In every cultivated language there are two great classes of words, which makes up the whole vocabulary. First, there are those words 【B1】 which we become familiar in daily conversation, which we 【B2】,...
A.
at
B.
with
C.
by
D.
through
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【单选题】The boys ______ their father because, although he was stern, he was fair.
A.
looked down upon
B.
looked up to
C.
looked up at
D.
looked up for
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【单选题】Java的前身是( )软件。
A.
NET
B.
Delphi
C.
Oak
D.
Basic
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【单选题】__________that no one enjoys__________________.
A.
He seems; to be looked down on
B.
He is seemed; being looked down upon
C.
It seems; to be looked down upon
D.
It seems; being looked down upon
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【简答题】He looked down at the floor in an attempt to hide his______(embarrass).
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【单选题】It is quite apparent that the aging population in China will cause _____ heavy pressure on ____ whole society in the future .
A.
a, /
B.
/ ;/
C.
a ; the
D.
/ ; the
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【单选题】He looked down from the mountain to the valley() .
A.
before
B.
beneath
C.
beyond
D.
behind
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【单选题】According to the article, Ashkenazim are related to the Jewish people in ______.
A.
the whole Europe and Eastern Asia
B.
Eastern Europe and a few other European countries
C.
Eastern Europe and a few Asian countries
D.
Eastern Europe and Germany
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【单选题】He looked me up and ______.
A.
low
B.
below
C.
down
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相关题目：
【单选题】It can be inferred from the passage that ______.
A.
the 1992 Los Angeles riots lasted a whole week
B.
Rodney King seemed very angry when he appeared on television on Friday
C.
media coverage of events as they occur can have either good or bad results
D.
most people who had seen the video of Rodney King beating agree with the verdict
查看完整题目与答案
【单选题】In every cultivated language there are two great classes of words, which makes up the whole vocabulary. First, there are those words 【B1】 which we become familiar in daily conversation, which we 【B2】,...
A.
at
B.
with
C.
by
D.
through
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【单选题】The boys ______ their father because, although he was stern, he was fair.
A.
looked down upon
B.
looked up to
C.
looked up at
D.
looked up for
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【单选题】Java的前身是( )软件。
A.
NET
B.
Delphi
C.
Oak
D.
Basic
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【单选题】__________that no one enjoys__________________.
A.
He seems; to be looked down on
B.
He is seemed; being looked down upon
C.
It seems; to be looked down upon
D.
It seems; being looked down upon
查看完整题目与答案
【简答题】He looked down at the floor in an attempt to hide his______(embarrass).
查看完整题目与答案
【单选题】It is quite apparent that the aging population in China will cause _____ heavy pressure on ____ whole society in the future .
A.
a, /
B.
/ ;/
C.
a ; the
D.
/ ; the
查看完整题目与答案
【单选题】He looked down from the mountain to the valley() .
A.
before
B.
beneath
C.
beyond
D.
behind
查看完整题目与答案
【单选题】According to the article, Ashkenazim are related to the Jewish people in ______.
A.
the whole Europe and Eastern Asia
B.
Eastern Europe and a few other European countries
C.
Eastern Europe and a few Asian countries
D.
Eastern Europe and Germany
查看完整题目与答案
【单选题】He looked me up and ______.
A.
low
B.
below
C.
down
查看完整题目与答案